docs: Fix glib-sections.txt includes for g_atomic_rc_* API
docs: Fix glib-sections.txt includes for g_atomic_rc_* API

These were not changed when g_arc_*() was renamed to g_atomic_rc_*().

Signed-off-by: Philip Withnall <29c2a2ac2a854b9cf047275aa9de346d096be2e0@endlessm.com>

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib